5087 8-bit inline atomic {add,or,and} use wrong reg constraints on x86
Reviewed by: Richard Lowe <richlowe@richlowe.net>
Reviewed by: Igor Kozhukhov <ikozhukhov@gmail.com>
Reviewed by: Keith Wesolowski <keith.wesolowski@joyent.com>
Approved by: Dan McDonald <danmcd@omniti.com>